Gate valve with track cleanout

ABSTRACT

Methods, systems, and apparatus for a gate valve include a valve body having an inner surface and an outer surface, the inner surface and the outer surface defining an inlet, an outlet, and a fluid path therebetween, a track defined in the inner surface, the track defining a bottom surface; a gate having a wing; a scraper having a leading edge, the scraper mounted to the wing of the gate; a biasing element, the biasing element biasing the leading edge of the scraper against the bottom surface of the track.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. application Ser. No.13/834,016, filed Mar. 15, 2013, which is hereby specificallyincorporated by reference herein in its entirety.

TECHNICAL FIELD

This disclosure relates to valves. More specifically, this disclosurerelates to gate valves.

BACKGROUND

Valve elements are used to regulate or control the flow of material byopening, closing, or partially obstructing various passageways. One typeof valve is a gate valve, which can be used in a number of applications.

SUMMARY

Disclosed is a gate valve including a valve body having an inner surfaceand an outer surface, the inner surface and the outer surface definingan inlet, an outlet, and a fluid path therebetween, a track defined inthe inner surface, the track defining a bottom surface; a gate having awing; a scraper having a leading edge, the scraper mounted to the wingof the gate; a biasing element, the biasing element biasing the leadingedge of the scraper against the bottom surface of the track.

Also disclosed is a gate valve including a valve body having an innersurface and an outer surface, the inner surface and the outer surfacedefining an inlet, an outlet, and a fluid path therebetween, the innersurface defining a bottom sealing surface and a track, the track havinga bottom surface and a filleted surface extending between the bottomsurface of the track and the bottom sealing surface of the innersurface; a gate engageable with the track of the valve body.

Also disclosed is a method of cleaning a gate valve including accessinga gate valve having a valve body including an inner surface and an outersurface, the inner surface and the outer surface defining an inlet, anoutlet, and a fluid path therebetween, the inner surface defining abottom sealing surface and a track, the track defined out of the fluidpath, the track having a bottom surface and a transition surface, thetransition surface extending between the bottom surface of the track andthe bottom sealing surface of the inner surface; moving a leading edgeof a scraper along the bottom surface of the track towards thetransition surface of the track; and lifting debris within the trackaway from the bottom surface of the track into the fluid path.

BRIEF DESCRIPTION OF THE DRAWINGS

The features and components of the following figures are illustrated toemphasize the general principles of the present disclosure.Corresponding features and components throughout the figures may bedesignated by matching reference characters for the sake of consistencyand clarity.

FIG. 1 is a perspective view of a gate valve in accordance with oneembodiment of the current disclosure.

FIG. 2 is a side cross-sectional view of a valve body of the gate valveof FIG. 1.

FIG. 3 is a front cross-sectional view of the valve body of FIG. 2 takenalong line 3-3.

FIG. 4 is a perspective view of the gate of the gate valve of FIG. 1.

FIG. 5 is a side view of the gate of FIG. 4.

FIG. 6 is a side view of a scraper assembly of the gate valve of FIG. 1including a scraper, a filler, and a guide cap.

FIG. 7 is a cross-sectional view of the scraper assembly of FIG. 6.

FIG. 8 is a perspective view of the scraper assembly of FIG. 6 with thefiller removed.

FIG. 9A is a side view of the guide cap of FIG. 6.

FIG. 9B is a cross-sectional view of the guide cap of FIG. 6.

FIG. 10A is a front cross-sectional view of the gate valve of FIG. 1showing the gate in an open position.

FIG. 10B is a front cross-sectional view of the gate valve of FIG. 1showing the gate in a partially-closed position.

FIG. 10C is a front cross-sectional view of the gate valve of FIG. 1showing the gate in a fully-closed position.

DETAILED DESCRIPTION

Disclosed is a gate valve with track cleanout and associated methods,systems, devices, and various apparatus. The gate valve includes a valvebody and a gate. It would be understood by one of skill in the art thatthe disclosed gate valve is described in but a few exemplary embodimentsamong many. No particular terminology or description should beconsidered limiting on the disclosure or the scope of any claims issuingtherefrom.

One embodiment of a gate valve 100 is disclosed and described in FIG. 1.In the current embodiment, the gate valve 100 includes a valve body 110,a bonnet 120, a top cover 130, and a gate 140. The top cover 130includes an operating nut 135 mounted on a cover drive shaft 137. Thebonnet 120 is coupled to the valve body 110 by a plurality of fasteners125, and the top cover 130 is coupled to the bonnet 120 by a pluralityof fasteners 132. In the current embodiment, the plurality of fasteners125,132 may comprise, nuts, bolts, or other fasteners known in the art.In some embodiments, the bonnet 120 may be coupled to the valve body 110and the top cover 130 may be coupled to the bonnet 120 by fasteners,welding, gluing, brackets, bayonet mounts, or any combination of theseor other fastening means. In other embodiments, the valve body 110, thebonnet 120, and/or top cover 130 may be formed or molded integrally.

The valve body includes an inner surface 112 and an outer surface 114.The inner surface 112 and the outer surface 114 define an inlet 116 andan outlet 118 (shown in FIG. 2). In the current embodiment, a flangedinlet end 160 is defined at inlet 116 and a flanged outlet end 180 isdefined at outlet 118, though the inlet 116 and the outlet 118 may notbe flanged in various embodiments. In the current embodiment, theflanged inlet end 160 and the flanged outlet end 180 may be coupled toflanged ends of various pipe elements (not shown) to allow the gatevalve 100 to be mounted in a piping system.

FIG. 2 shows a side cross-sectional view of the valve body 110 of thecurrent embodiment. As shown in FIG. 2, in the current embodiment, theinner surface 112 and outer surface 114 define a gate opening 210. Theinner surface 112 defines a fluid path 250 between the inlet 116 and theoutlet 118. In the current embodiment, the fluid path 250 is parallel toan axial direction 260. Perpendicular to the axial direction 260 andextending towards gate opening 210 is radial direction 270. The innersurface 112 also defines tracks 220 a,b (220 b shown in FIG. 3). Thetracks 220 a,b extend between the gate opening 210 and a bottom sealingsurface 230 defined in the inner surface 112 opposite to the gateopening 210. The track 220 a includes track walls 322 a,b, and track 220b includes track wall surfaces 324 a,b (324 a shown in FIG. 3, 324 b notshown).

In the current embodiment, defined adjacent to the track 220 a are guidesurfaces 222 a,b, and defined adjacent to the track 220 b are guidesurfaces 224 a,b (224 a shown in FIG. 3, 224 b not shown). In thecurrent embodiment, guide surfaces 222 a,b,224 a,b are flat and parallelto radial direction 270, though the presence, surface shape, andorientation of the guide surfaces 222 a,b,224 a,b should not beconsidered limiting. Extending from guide surfaces 222 a,b,respectively, adjacent to track 220 a, are angled rest surfaces 232 a,b,and extending from guide surfaces 224 a,b, respectively, adjacent totrack 220 b, are angled rest surfaces 234 a,b (234 a shown in FIG. 3,234 b not shown). In the current embodiment, angled rest surfaces 232a,b,234 a,b are flat and slope from guide surfaces 222 a,b,224 a,b,respectively, towards bottom sealing surface 230.

In the current embodiment, a gate opening surface 215 a extends betweenguide surface 222 a and guide surface 224 b, and a gate opening surface215 b extends between guide surface 222 b and guide surface 224 a. Gateopening transition surface 217 a extends between gate opening 210, guidesurfaces 222 a,b, track 220 a, and gate opening surfaces 215 a,b. Gateopening transition surface 217 b (shown in FIG. 3) extends between gateopening 210, guide surfaces 224 a,b, track 220 b, and gate openingsurfaces 215 a,b. An upper sealing surface 226 a extends along a bottomedge 213 a of gate opening surface 215 a, and an upper sealing surface226 b extends along a bottom edge 213 b of gate opening surface 215 b.Upper sealing surfaces 226 a,b slope inwards from bottom edges 213 a,b,respectively, towards tracks 220 a,b.

FIG. 3 shows a cross-sectional view of the valve body 110 taken alongline 3-3 in FIG. 2. FIG. 3 shows radial direction 270 and a secondtransverse radial direction 370 perpendicular to radial direction 270.As shown in the FIG. 3, the track 220 a defines a track bottom surface320 a, a track filleted surface 330 a, and a track transition surface340 a, and the track 220 b defines a track bottom surface 320 b, a trackfilleted surface 330 b, and a track transition surface 340 b. The trackbottom surfaces 320 a,b extend from gate opening transition surfaces 217a,b, respectively, towards track filleted surfaces 330 a,b,respectively. Track filleted surfaces 330 a,b extend from track bottomsurfaces 320 a,b, respectively, towards track transition surfaces 340a,b, respectively. Track transition surfaces 340 a,b slope from trackfilleted surfaces 330 a,b towards bottom sealing surface 230. In thecurrent embodiment, track bottom surfaces 320 a,b are parallel to radialdirection 270 and guide surfaces 222 a,b,224 a,b, though the presence,surface shape, and orientation of the track bottom surfaces 320 a,bshould not be considered limiting.

In the current embodiment, track filleted surfaces 330 a,b and tracktransition surfaces 340 a,b provide smooth transitions from track bottomsurfaces 320 a,b to bottom sealing surface 230. In addition, trackfilleted surfaces 330 a,b and track transition surfaces 340 a,b providea smooth transition into the fluid path 250. Track filleted surfaces 330a,b are each formed with a radius sufficient in length to permit debris1050 (shown in FIG. 10A) to be easily moved from track 220 a,b intofluid path 250, so that the debris 1050 is not trapped in track filletedsurfaces 330 a,b. Moreover, in the current embodiment, the radius ofeach of track filleted surfaces 330 a,b is larger than incidentalfilleted surfaces formed within tracks by machine or molding toleranceswhere a sharp corner between flat surfaces is not possible to create,such as in cast iron molding. As shown in FIG. 3, the cross-section ofthe fluid path 250 taken along line 3-3 is substantially circular in thecurrent embodiment.

As shown in FIG. 3, upper sealing surface 226 b extends along the bottomedge 213 b of gate opening surface 215 b towards angled rest surfaces232 b,234 a. Upper sealing surface 226 a likewise extends along thebottom edge 213 a of gate opening surface 215 a towards angled restsurfaces 232 a,234 b. Upper sealing surfaces 226 a,b and angled restsurfaces 232 a,b,234 a,b thus form, in the current embodiment,continuous sloped surfaces extending between tracks 220 a,b, eachsurface sloping toward bottom sealing surface 230.

FIG. 4 shows a perspective view of gate 140. In the current embodiment,the gate 140 is an encapsulated disc having a rigid cast iron interiorand a flexible, water-impervious outer rubber shell, though the gate 140may include different materials or combinations of materials in variousembodiments, such as stainless steel, plastics, wood, fiberglass, or anyother material, and the disclosure of an encapsulated disc should not beconsidered limiting. In the current embodiment, the gate 140 includesupper sealing rims 410 a,b, lower sealing lips 420 a,b, wings 430 a,disc nut retainers 440 a,b, and an actuation bore 450.

FIG. 5 shows a side view of the gate 140. As shown in FIG. 5, in thecurrent embodiment, the wing 430 a includes a straight portion 532 a anda filleted portion 534 a, and the wing 430 b includes a straight portion532 b and a filleted portion 534 b. The radii of filleted portions 534a,b, in the current embodiment, are larger than radii of incidentalfillets formed by machine or molding tolerances. The wing 430 a definesa pair of connection channels 536 a,b (536 b not shown) on each side ofwing 430 a, and the wing 430 b defines a pair of connection channels 536c,d (536 c not shown) on each side of wing 430 b. Connection channels536 a,b extend along the base of straight portion 532 a and the base offilleted portion 534 a, and connection channels 536 c,d extend along thebase of straight portion 532 ba and the base of filleted portion 534 b.

In the current embodiment, upper sealing rims 410 a,b extend in anapproximate C-shaped curve along gate 140 that approximates the curve ofupper sealing surfaces 226 a,b, respectively. In addition, lower sealinglips 420 a,b extends in an approximate C-shaped curve along gate 140that approximates the curve of bottom sealing surface 230. In thecurrent embodiment, gate 140 also defines angled sealing surfaces 522a,b (522 b not shown) adjacent to wing 430 a and angled sealing surfaces524 a,b (524 a not shown) adjacent to wing 430 b. Filleted sealingsurfaces 526 a,b (526 b not shown) are defined on gate 140 betweenangled sealing surfaces 522 a,b, respectively, and lower sealing lips420 a,b, respectively. Likewise, filleted sealing surfaces 528 a,b (528a not shown) are defined on gate 140 between angled sealing surfaces 524a,b, respectively, and lower sealing lips 420 a,b, respectively. In thecurrent embodiment, the curve formed by angled sealing surface 522 a,filleted sealing surface 526 a, lower sealing lip 420 a, filletedsealing surface 528 b, and angled sealing surface 524 b is approximatelysimilar to the curve formed by angled sealing surface 522 b, filletedsealing surface 526 b, lower sealing lip 420 b, filleted sealing surface528 a, and angled sealing surface 524 a.

In the current embodiment, disc nut retainers 440 a,b extend from thegate 140 adjacent to actuation bore 450 on the opposite side of the gate140 from lower sealing lips 420 a,b. Disc nut retainers 440 a,b aresized to accept and retain a disc nut 1010 (shown in FIG. 10A). Disc nutretainers 440 a,b include retaining ledges 445 a,b, respectively,forming retention channels 447 a,b, respectively.

FIG. 6 shows a scraper assembly 600. The scraper assembly 600 includes aguide cap 610, a scraper 620, and a filler 630. In the currentembodiment, the guide cap 610 is coupled to the scraper 620 by a hingedconnection 640. The filler 630 is coupled to the scraper 620 by gluing,though the filler 630 may be coupled to the scraper 620 by any knownmethod, including welding, fastening by mechanical attachment,overmolding by molding the filler 630 to fully or partially encapsulatethe scraper 620, or forming integrally, and the disclosure of gluingshould not be considered limiting. In the current embodiment, the filler630 includes a plurality of through-holes 632 defined extending throughthe filler 630. In the current embodiment, the filler 630 is formed froma flexible, water-impervious material such as rubber, and the scraper620 and guide cap 610 are formed of a rigid, water-impervious materialsuch as rigid plastic. In various embodiments, the filler 630, scraper620, and guide cap 610 may be formed of various materials, and thedisclosure of rubber and rigid plastic should not be consideredlimiting.

In the current embodiment, the scraper 620 includes a flat portion 622,a curved portion 624, and a leading edge 626. The hinged connection 640includes a first half peg 642, a second half peg 644 (shown in FIG. 8),and a screw 646 connecting first half peg 642 and second half peg 644 toform a hinge pin, though the hinged connection 640 may include variouselements in various embodiments, including single-body hinge pins,welded or glued flaps, or intregral flaps created by forming the guidecap 610 and the scraper 620 as a single unit, among others. In thecurrent embodiment, the hinged connection 640 couples the guide cap 610to the scraper 620 through cap hinge holes 612 a,b (612 a shown in FIG.8) defined in the guide cap 610 and through scraper hinge holes 628 a,b(628 b shown in FIG. 8, 628 a not shown).

FIG. 7 shows a cross-sectional view of the scraper assembly 600. Asshown in FIG. 7, the scraper assembly 600 also includes a biasingelement 710. In the current embodiment, the biasing element 710 is apair of torsion springs 720 a,b (720 b shown in FIG. 8) mounted aroundfirst half peg 642 and second half peg 644 of the hinged connection 640,though the biasing element 710 may be different in various embodiments,such as compression springs, leaf springs, rubber wedges, a cantileveredrod, or any other method of biasing. Further, biasing element 710 may bemounted in different locations, and the disclosure of the biasingelement 710 mounted around hinged connection 640 should not beconsidered limiting. Biasing element 710 may also be formed into thescraper 620 itself through the shape and composition of the scraper 620,such that the scraper 620 is flexible and elastically deformable tobring the scraper 620 back into its original shape when the scraper 620is subjected to a flexing force. In the current embodiment, the torsionspring 720 a includes a coiled portion 722 a, a first leg 724 a, and asecond leg 726 a. Likewise, the torsion spring 720 b includes a coiledportion 722 b, a first leg 724 b, and a second leg 726 b, as shown inFIG. 8. The first legs 724 a,b contact the guide cap 610, and the secondlegs 726 a,b contact the scraper 620. The second legs 726 a,b liebetween the scraper 620 and the filler 630.

In the current embodiment, the guide cap 610 includes an outer wall 730,and upper wall 732, and a pair of side walls 740 a,b (735 b shown inFIG. 8). Defined in side walls 740 a,b are connection ridges 742 a,b,respectively (742 b shown in FIG. 8). Each connection ridge 742 a,b runsalong an edge of the side walls 740 a,b opposite from outer wall 730.Each connection ridge 742 a,b is receivable with connection channels 536c,d, respectively, or connection channels 536 a,b, to couple the guidecap 610 to one of the wings 430 b,a, and thereby mount the scraperassembly 600 on gate 140.

FIG. 8 shows a perspective view of the scraper assembly 600 with thefiller 630 removed. As shown in FIG. 8, the scraper 620 includes a pairof hinge arms 840 a,b, each respective hinge arm 840 defining therespective scraper hinge holes 628 a,b. In the current embodiment, theguide cap 610 of the current embodiment defines a hinge recess 810 whichreceives the hinge arms 840 a,b and the hinged connection 640. In thecurrent embodiment, the first legs 724 a,b of the torsion springs 720a,b contact the guide cap 610 along a cap-spring interaction surface812, and the second legs 726 a,b of the torsion springs 720 a,b contactthe scraper 620 along a scraper-spring interaction surface 830. Further,as shown in FIG. 8, the screw 646 of the hinged connection 640 is acountersunk-head screw, and the second half peg 644 defines acountersink (not shown) that is sized to accept the countersunk-headscrew 646. However, the screw 646 may not be a countersunk-head screw invarious embodiments, and the disclosure of a countersunk-head screwshould not be considered limiting on the present disclosure. In variousembodiments, the screw 646 may be a counterbore-head screw, a hex capscrew, or a domed-head screw, among others.

FIG. 9A shows a side view of the guide cap 610, and FIG. 9B shows a sidecross-sectional view of the guide cap 610. As shown in FIG. 9A, the caphinge hole 612 b is defined in side wall 740 b, and shown in FIG. 9B,the cap hinge hole 612 a is defined in side wall 740 a. In the currentembodiment, the side walls 740 a,b include curved portions 910 a,b,respectively. The curved portions 910 a,b extend from a lower edge 920of the guide cap 610 to outer wall 730, forming an outer profile thatallows the outer wall 730 to mate with either of track bottom surfaces320 a,b and allows the curved portions 910 a,b to rest adjacent to, ormate with, either of track filleted surface 330 a,b when the guide cap610 is coupled to either of wings 430 a,b and when the gate 140 is in aclosed position within the valve body 110, as shown in FIG. 10C.

FIGS. 10A, 10B, and 10C show the gate valve 100 in operation. FIG. 10Ashows the gate valve 100 in an open position. In the current embodiment,the gate valve 100 operates with the track 220 b vertically lower thanthe track 220 a, and with the radial direction 270 extendinghorizontally, such that the operating nut 135 is located at a verticalhigh point of the top cover 130. When the gate valve 100 is oriented inthe position shown in FIGS. 10A, 10B, and 10C, the scraper assembly maybe mounted on wing 430 b. In various embodiments where the gate valve100 is buried underground and mounted on a water main, for example,placing the gate valve 100 with the radial direction 270 extendinghorizontally may allow the gate valve 100 to be fully buried at ashallower depth than if the radial direction 270 extends vertically,reducing the digging effort to fully bury the gate valve 100. In variousembodiments, the gate valve may be oriented in different positions, andthe scraper assembly 600 may be mounted to either wing 430 a or wing 430b, or a second scraper assembly 600′ similar or identical to scraperassembly 600 may be mounted to wing 430 a in addition to scraperassembly 600 being mounted to wing 430 b.

As shown in FIGS. 10A, 10B, and 10C, the disc nut 1010 is retainedwithin disc nut retainers 440 a,b of the gate 140. The disc nut 1010 hasinternal threads 1012. Also shown in FIGS. 10A, 10B, and 10C is stem1020 having external threads 1022. In the current embodiment, stem 1020is connected to the top cover 130 such that rotation of the operatingnut 135 causes rotation of the stem 1020. Rotation of the operating nut135 in one direction causes rotation of the stem 1020 in one direction,and rotation of the operating nut 135 in the opposite direction causesrotation of the stem 1020 in the opposite direction. External threads1022 of the stem 1020 interact with internal threads 1012 of the discnut 1010 to move the disc nut 1010 along stem 1020, thereby moving gate140 along stem 1020. Rotation of the stem 1020 in one direction causesthe disc nut 1010, and thereby the gate 140, to move in one directiontowards or away from bottom sealing surface 230, and rotation of thestem 1020 in the opposite direction causes the disc nut 1010, andthereby the gate 140, to move in the opposite direction away from ortowards the bottom sealing surface 230. However, the gate 140 may bemoved by any method in various embodiments, including a hand crank orhand wheel coupled to the stem 1020, directing fluid pressure to movethe gate 140, or using a rod to push or pull the gate 140, for instance,and the disclosure of operating nut 135, disc nut 1010, and stem 1020should not be considered limiting.

In the open position, the gate 140 is recessed within a gate recess 1030defined within the bonnet 120 such that the gate 140 is out of fluidpath 250. In the current embodiment, the scraper assembly 600 is mountedto the gate 140 by pushing the guide cap 610 onto straight portion 532 band a filleted portion 534 b of wing 430 b, thereby placing connectionridges 742 a,b (shown in FIG. 8) within connection channels 536 c,d,respectively, such that connection ridges 742 a,b resist removal ofscraper assembly 600 from wing 430 b. Guide cap 610′ is mounted to wing430 a similarly to guide cap 610 mounted to wing 430 b. However, invarious embodiments, the scraper assembly 600 may be mounted to the gate140 by any method, including a pin, fastener, gluing, welding,overmolding, or forming the scraper assembly integrally with gate 140,and the disclosure of connection ridges 742 a,b within connectionchannels 536 c,d should not be considered limiting. Further, the discwings 430 a,b may be configured to contact outer wall 730 of guide cap610, along its entirety or along only a portion of outer wall 730, whenguide cap 610 is mounted on either of disc wings 430 a,b in variousembodiments or, in other various embodiments, the disc wings 430 a,b maynot contact outer wall 730 when guide cap 610 is mounted on either ofdisc wings 430 a,b.

In the open position, the biasing element 710 biases the leading edge626 of the scraper 620 against track bottom surface 320 b of the track220 b. In the current embodiment, the scraper 620 is sized to fit withintrack 220 b, and the leading edge 626 of the scraper 620 is sized toextend approximately between track wall surfaces 324 a,b. In operation,when a fluid passes along the fluid path 250 from inlet 116 to outlet118, debris 1050 may accumulate in track 220 b. Debris 1050 may includesand, dirt, pebbles, grease, or any other material that may be presentwithin the fluid.

FIG. 10B shows the gate 140 in a partially closed position. As shown inFIG. 10B, the guide caps 610, 610′ fit within tracks 220 b,a,respectively. In the current embodiment, the rigid material of the guidecaps 610,610′ may protect the flexible, water-impervious exterior of thegate 140 from the inner surface 112 of the valve body 110 and may allowthe gate 140 to slide easily within tracks 220 b,a. As the gate 140approaches the closed position and bottom sealing surface 230, theleading edge 626 of the scraper 620 slides along track filleted surface330 b, sliding partially in a direction parallel to second transverseradial direction 370. As the leading edge 626 of the scraper 620 slidesalong track filleted surface 330 b, the scraper 620 and filler 630 liftdebris 1050 into a shrunken fluid path 250′. As the gate 140 approachesbottom sealing surface 230, the fluid path 250 shrinks, and whenshrunken fluid path 250′ is present, fluid flow through shrunken fluidpath 250′ is increased as the cross-sectional area between gate 140 andbottom sealing surface 230 in which fluid can travel shrinks. Thisincreased fluid flow assists in carrying away debris 1050 as the scraper620 and filler 630 lift the debris 1050 into shrunken fluid path 250′.

As the leading edge 626 slides along track filleted surface 330 b andtrack transition surface 340 b partially in a direction parallel tosecond transverse radial direction 370, the scraper 620 rotates abouthinged connection 640, pressing filler 630 against gate 140, therebycompressing filler 630. In the current embodiment, through-holes 632 ofthe filler 630 allow fluid to pass through filler 630 and allowcompression of filler 630 against gate 140.

FIG. 10C shows the gate 140 in a fully closed position. As shown in FIG.10C, lower sealing lips 420 a,b of the gate 140 are in contact with thebottom sealing surface 230 and the debris 1050 has been removed. Nofluid path exists when the gate 140 is in the closed position. Theleading edge 626 of the scraper 620 is in contact with the bottomsealing surface 230, compressing the filler 630 between the scraper 620and the gate 140, though the leading edge 626 may be in contact with thetrack filleted surface 330 b or a track transition surface 340 b invarious embodiments. In addition, the scraper 620 may also be flexibleso that the scraper 620 may bend to conform with the track filletedsurfaces 330 b and the track transition surface 340 b when the gate 140is in the closed position, as shown in FIG. 10C. In the currentembodiment, the guide caps 610,610′ rest within tracks 220 b,a,respectively along track bottom surfaces 320 b,a, respectively, andtrack filleted surfaces 330 b,a, respectively.

In addition, in the current embodiment, upper sealing rims 410 a,b arein sealing contact with upper sealing surfaces 226 a,b, respectively.Further, angled sealing surface 522 a, filleted sealing surface 526 a,lower sealing lip 420 a, filleted sealing surface 528 b, and angledsealing surface 524 b are in sealing contact with angled rest surface232 a, bottom sealing surface 230, and angled rest surface 234 b.Further, angled sealing surface 522 b, filleted sealing surface 526 b,lower sealing lip 420 b, filleted sealing surface 528 a, and angledsealing surface 524 a are in sealing contact with angled rest surface232 b, bottom sealing surface 230, and angled rest surface 234 a. Invarious embodiments, fluid may press against gate 140 in the closedposition and may allowably break the seal between upper sealing rims 410a and upper sealing surface 226 a, entering gate recess 1030. However,the seal between upper sealing rims 410 b and upper sealing surface 226b would still be maintained, preventing fluid from flowing around gate140 towards outlet 118.

When the gate 140 is moved towards the open position by rotating thestem 1020 in the opposite direction, the fluid path 250 is reopened,allowing fluid to flow from inlet 116 to outlet 118. The leading edge626 of the scraper 620 is biased against track transition surface 340 b,track filleted surface 330 b, and the track bottom surface 320 b of thetrack 220 b as the gate 140 returns to the open position. The processshown in FIGS. 10A, 10B, and 10C may be repeated if some debris 1050remains in track 220 b, or at a later time if debris 1050 againaccumulates within track 220 b.

In various embodiments, the filler 630 may not be included in scraperassembly 600. In addition, in various embodiments, the scraper 620 maybe directly mounted to the gate 140 by various connections, includinghinges. The biasing element 710 may be integrated into any of thescraper 620, guide cap 610, or gate 140, or may be included as aseparate element that interacts with any of the scraper 620, guide cap610, or gate 140 in various embodiments.

One should note that conditional language, such as, among others, “can,”“could,” “might,” or “may,” unless specifically stated otherwise, orotherwise understood within the context as used, is generally intendedto convey that certain embodiments include, while other embodiments donot include, certain features, elements and/or steps. Thus, suchconditional language is not generally intended to imply that features,elements and/or steps are in any way required for one or more particularembodiments or that one or more particular embodiments necessarilyinclude logic for deciding, with or without user input or prompting,whether these features, elements and/or steps are included or are to beperformed in any particular embodiment.

It should be emphasized that the above-described embodiments are merelypossible examples of implementations, merely set forth for a clearunderstanding of the principles of the present disclosure. Any processdescriptions or blocks in flow diagrams should be understood asrepresenting modules, segments, or portions of code which include one ormore executable instructions for implementing specific logical functionsor steps in the process, and alternate implementations are included inwhich functions may not be included or executed at all, may be executedout of order from that shown or discussed, including substantiallyconcurrently or in reverse order, depending on the functionalityinvolved, as would be understood by those reasonably skilled in the artof the present disclosure. Many variations and modifications may be madeto the above-described embodiment(s) without departing substantiallyfrom the spirit and principles of the present disclosure. Further, thescope of the present disclosure is intended to cover any and allcombinations and sub-combinations of all elements, features, and aspectsdiscussed above. All such modifications and variations are intended tobe included herein within the scope of the present disclosure, and allpossible claims to individual aspects or combinations of elements orsteps are intended to be supported by the present disclosure.

That which is claimed is:
 1. A gate valve comprising: a valve bodyhaving an inner surface and an outer surface, the inner surface and theouter surface defining an inlet, an outlet, and a fluid paththerebetween, a track defined in the inner surface, the track defining abottom surface; a gate having a wing; a scraper having a flat portionextending parallel to the bottom surface of the track when the scraperis at rest and a curved portion extending from the flat portion, thecurved portion comprising a profile bending toward the bottom surface ofthe track when the scraper is at rest and terminating in a leading edge,the scraper mounted to the wing of the gate; and a biasing element, thebiasing element biasing the leading edge of the scraper against thebottom surface of the track.
 2. The gate valve of claim 1, wherein thebiasing element is at least one torsion spring.
 3. The gate valve ofclaim 2, wherein the at least one torsion spring is two torsion springs.4. The gate valve of claim 1, wherein the track defines a filletedsurface extending from the bottom surface of the track.
 5. The gatevalve of claim 4, wherein the track further defines a transition surfaceextending from the filleted surface to a bottom sealing surface of thevalve body, the transition surface and the filleted surface forming asmooth transition between the bottom surface of the track and the fluidpath, and wherein the gate is contactable with the bottom sealingsurface of the valve body.
 6. The gate valve of claim 1, furthercomprising a guide cap mounted on the wing of the gate, the guide capconnected to the scraper.
 7. The gate valve of claim 6, wherein: theguide cap includes at least one connection ridge; the wing of the gateincludes at least one connection channel; and the guide cap is mountedon the wing by placement of the connection ridge of the guide cap withinthe connection channel of the wing.
 8. The gate valve of claim 6,wherein the guide cap is connected to the scraper by a hingedconnection.
 9. The gate valve of claim 8, wherein the biasing element ismounted to the hinged connection.
 10. A gate valve comprising: a valvebody having an inner surface and an outer surface, the inner surface andthe outer surface defining an inlet, an outlet, and a fluid paththerebetween, the inner surface defining a bottom sealing surface and atrack, the track having a bottom surface and a filleted surfaceextending between the bottom surface of the track and the bottom sealingsurface of the inner surface; a gate engageable with the track of thevalve body, the gate comprising a wing defining a connection channel;and a guide cap mounted to the gate, the guide cap having a side wallincluding a curved portion, the curved portion of the side wall restingadjacent to the filleted surface of the track when the gate is in aclosed position within the valve body, the side wall defining aconnection ridge receivable within the connection channel.
 11. The gatevalve of claim 10, wherein the wing of the gate includes a filletedportion and a straight portion.
 12. The gate valve of claim 10, whereinthe track includes a transition surface extending from the filletedsurface to the bottom sealing surface of the inner surface.
 13. The gatevalve of claim 10, further comprising a scraper mounted to the guidecap, the scraper contacting the track.
 14. The gate valve of claim 12,further comprising filler coupled to the scraper, the filler formed froma flexible, water-impervious material and having a through-hole formedtherein allowing water to pass through the filler when the gate is in anopen position or in a partially-closed position.